I think we're talking about a couple different things here. When I'm talking about the smaller center ring, I mean the ring that bolts to the steering hub. The factory wheels were a smallish 6-bolt pattern, while the wheels in the Moss catalog (as pictured) use a 9-bolt pattern. I verified this looking at "Original Sprite & Midget" and "More Healeys" by Geoff Healey. Yes, I'm a Healey book geek, what can I say. /bcforum/images/%%GRAEMLIN_URL%%/grin.gif
I do see that Moss offers the 28mm and 46mm size, but that seems to be just for the horn push (I could be wrong here). The wheels are not listed in 2 sizes, so my assumption (again, this could very well be wrong) is that they all use the larger 9-bolt pattern, and it's just the actual horn push that is different. The original wheel used the lightning-bolt horn button from the stock wheel.
You can see an original wheel here, also in the attached picture (a scan from the Horler book):
https://www.pbase.com/mdlempert/sebring
Another small detail is that the original wheel used even spacing for the 3 spokes, while the Moss wheels space them closer together towards the bottom, so there is a nice, big open space at the top.
None of this is to say either is better or worse, just different. I was real close to using wheel #04 on that same page, in a 14" size. It's a nice looking wheel, as is Jack's slotted one. It's nice that we actually have options!
BTW: Jack's wheel is E on this Moss online catalog page:
https://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=35371